We stud ied speleothem-frac tur ing styles and their tec tonic con text in three cave sys tems sit u ated in the east ern Bo he mian Mas sif, close to the West ern Carpathians orogenic front: the Za hájovnou, Javoříčko, and Mladeč caves. The mor phol ogy of the speleothems in par tic u larly thin sta lac tites, and sup port ing ev i dence from the cave in te rior, in di cates a tec tonic or i gin of the break age. U/Th se ries dat ing of the sta lac tites, sup ported by Op ti cally Stim u lated Luminiscence (OSL) and 14 C dat ing of soft sed i ments in di cate that most of the frac tur ing oc curred in the Up per Pleis to cene, with the last frac tur ing events cor respond ing to MIS6 and MIS5 stages. OSL dat ing of faulted soft-sed i ment infill may even in di cate that lat est Pleis to cene to Early Ho lo cene tec tonic events oc curred in the Mladeč Cave. The speleothem frac tur ing is dis cussed in the re gional con text of the seis mi cally ac tive Nysa-Morava Zone sit u ated at the junc tion be tween the Bo he mian Mas sif (Elbe Fault Zone) and the West ern Carpathians. This study pro vides the first ev i dence of palaeoseismicity from the subsurface and the old est dated palaeoseismicity from the con tact be tween the West ern Carpathians and the Bo he mian Mas sif.